Hi Showa

Red Showa. Showa Sanshoku with many Hi plates and very little Shiroji. It is not a variety name but rather a description of the amount of Hi versus Shiroji. Since Kindai Showa Sanshoku that have a lot of Shiroji came to be more available the traditional or older type of Showa came to be called Hi Showa. 

(Courtesy of the excellent Book Kokugyo Vol II)